Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f45fe2f0c769bb…

MALICIOUS

PDF

42.0 KB Created: 2020-07-31 23:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acae1c17a819bcaf2bd3f5b76269ce42 SHA-1: d9a12679b78e7e649cdf4fd9d465817e7ae65dd9 SHA-256: a7f45fe2f0c769bbdf89b42ce17782205b5d528c43c7c3730f43736773c06112
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=52+country+code', which is also flagged as a malicious redirector. The presence of numerous links, many hosted on Shopify, suggests an attempt to create a link farm for SEO poisoning or to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=52+country+code
    • http://files.avatarborzoi.com/uploads/1/3/1/8/131871687/4034639.pdf
    • http://files.katiemachain.com/uploads/1/3/1/4/131455283/57a787ca629.pdf
    • http://files.themudlakeproject.ca/uploads/1/3/0/8/130874612/viwegiduwo-rarodinetesuwom-resejato-dovibulureja.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/54837845110.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/35257479996.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/dorolufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/lejurutemifimepoze.pdf
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/33010519785.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/romokononezolivelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81599599528.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/rujiwomedekikakalowiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/tuxajubukaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f0.bin
374cad2f1a414326f2ce574ca09a40e8ea7d829a030fcbe8b8de34713394f685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 4776 bytes
font_01_sfnt_off0000774d.bin
35e70160d8bda334d08bf3dff181cde12e303f51d25efb53ce0c818e6db96cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 11008 bytes

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